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Equity - Changes in stockholders' equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2021
Apr. 30, 2021
Jul. 31, 2020
Apr. 30, 2020
Jul. 31, 2021
Jul. 31, 2020
Jan. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning of period $ 221,175 $ 207,235 $ 193,911 $ 201,212 $ 207,235 $ 201,212 $ 201,212
Exercise of stock options (in shares)         1,471,011    
Exercise of stock options 2,274 12,111 4,751 1,896 $ 14,385   16,516
Vested restricted stock units converted to common shares 0 0 0 0 0   0
Issuance of restricted stock 0 0 0 0 0   0
Issuance of common stock under employee stock purchase plan   3,817   3,743 3,817   7,000
Stock-based compensation 20,730 15,288 17,752 17,617 36,018   74,417
Other comprehensive income (loss) (8) 355 2,250 (1,333) 347   2,782
Net loss (27,592) (17,631) (25,116) (29,224) (45,223) (54,340) (94,692)
End of period $ 216,579 $ 221,175 $ 193,548 $ 193,911 $ 216,579 $ 193,548 $ 207,235
Common Stock              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning of period (in shares) 126,215,000 123,989,000 117,524,000 115,830,000 123,989,000 115,830,000 115,830,000
Beginning of period $ 132 $ 130 $ 124 $ 122 $ 130 $ 122 $ 122
Exercise of stock options (in shares) 402,000 1,069,000 935,000 391,000 1,471,000   3,064,000
Exercise of stock options $ 1 $ 1 $ 1 $ 1 $ 2   $ 3
Vested restricted stock units converted to common shares (in shares) 1,172,000 871,000 1,041,000 903,000 2,043,000   4,358,000
Vested restricted stock units converted to common shares $ 1 $ 1 $ 1 $ 1 $ 2   $ 4
Issuance of restricted stock (in shares) 11,000 4,000 12,000 26,000 15,000   38,000
Issuance of common stock under employee stock purchase plan (in shares)   282,000   374,000 282,000   699,000
Issuance of common stock under employee stock purchase plan             $ 1
End of period (in shares) 127,800,000 126,215,000 119,512,000 117,524,000 127,800,000 119,512,000 123,989,000
End of period $ 134 $ 132 $ 126 $ 124 $ 134 $ 126 $ 130
Additional Paid-in Capital              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning of period 765,147 733,933 659,262 636,008 733,933 636,008 636,008
Exercise of stock options 2,273 12,110 4,750 1,895 14,383   16,513
Vested restricted stock units converted to common shares (1) (1) (1) (1) (2)   (4)
Issuance of common stock under employee stock purchase plan   3,817   3,743 3,817   6,999
Stock-based compensation 20,730 15,288 17,752 17,617 36,018   74,417
End of period 788,149 765,147 681,763 659,262 788,149 681,763 733,933
Accumulated Other Comprehensive Income (Loss)              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning of period 2,777 2,422 (1,693) (360) 2,422 (360) (360)
Other comprehensive income (loss) (8) 355 2,250 (1,333) 347   2,782
End of period 2,769 2,777 557 (1,693) 2,769 557 2,422
Accumulated Deficit              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning of period (534,976) (517,345) (451,877) (422,653) (517,345) (422,653) (422,653)
Net loss (27,592) (17,631) (25,116) (29,224) (45,223)   (94,692)
End of period (562,568) (534,976) (476,993) (451,877) (562,568) (476,993) (517,345)
Treasury Stock              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning of period (11,905) (11,905) (11,905) (11,905) (11,905) (11,905) (11,905)
End of period $ (11,905) $ (11,905) $ (11,905) $ (11,905) $ (11,905) $ (11,905) $ (11,905)